<?php

/**
 * App_Utf8::ltrim
 *
 * @author Kohana Team
 * @copyright (c) 2007 Kohana Team
 * @copyright (c) 2005 Harry Fuecks
 * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
 */
function _ltrim($str, $charlist = null)
{
    if ($charlist === null)
    return ltrim($str);
    if (App_Utf8::is_ascii($charlist))
    return ltrim($str, $charlist);
    $charlist = preg_replace('#[-\[\]:\\\\^/]#', '\\\\$0', $charlist);
    return preg_replace('/^[' . $charlist . ']+/u', '', $str);
}